Spray gun



FIG. 1 is a perspective view of a spray gun, showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a right side elevational view, the left side elevational view being a mirror image thereof;

FIG. 4 is a front elevational view;

FIG. 5 is a rear elevational view; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a spray gun, as shown and described. 